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Seen a few of these around, growing on walls. They have reddish hairy leaves and purple flowers. Haven't been able to identify them by googling. Can anyone help?
It is Herb Robert, Geranium robertianum.
It is usually somewhat reddish, but in damp shade it is greener.
Reddish colouration can be exaggerated in many plants, as a reaction to cold and/or sunshine and/or other factors.
Thank you very much